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Iterative Ptychography Features​

5 ÅIterations05e-37e-39e-3204060NMSEGradient descentGradient descent (GD)Alternating projections (AP)Difference map (DM)Relaxed avg. alt. refl. (RAAR)Relax reflect reflect (RRR)Bayesian-optimized (BO-GP)Alternating projectionsDifference mapRelaxed avg. alt. refl.Relax reflect reflectBayesian optimizedPtychographic reconstruction convergence
Importance of Parameter Optimization and Regularization!
2 nm2 nm1 1/A1 1/AUnoptimized reconstructionOptimized & regularized reconstruction

Few-layer hBN sample from Dana Byrne and Dr. Frances Allen, UCB & NCEM
Imaging and reconstruction from Dr. Stephanie Ribet, NCEM